It takes about 81 joules to melt one gram of gallium. During the melting, the temperature stays constant. Which has higher entropy, a gram of liquid gallium at 3° C or a gram of solid gallium at 3° C (276 K)? solid liquid How large is this difference in the entropy between the two forms of gallium?

Explanation:

Entropy is the measure of a thermodynamic system's thermal energy per unit temperature that is usually not available for doing useful work. It is also a measure of the degree of disorderliness or molecular randomness of a system.

a gram of gallium liquid has a higher entropy compared to a gram of solid gallium at 3 ° C for both of them because the liquid has more energy and the particles can translate compared to the solid form

change in entropy when temperature is constant = Q / T  = 81 Joules / 276 K = 0.293 J/K

unlike poles attract

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.